CRP and diabetes mellitus: When potential variables such as PD duration, diabetes, CRP/HDL-C, and SII were included, the multivariate stepwise regression analysis revealed that SII (β: 0.001; 95% CI:1.001 to 1.001; p < 0.001), CRP/HDL-C (β:0.004; 95% CI: 1 to 1.009; p = 0.041) and Diabetes mellitus (β:0.823; 95%CI: 1.1 to 4.72; p = 0.027) were independent variables related to frequent PDAP.